Introduction Behaviour of alcohol drinkers during previous major public health or economic crises has varied, with reductions in use generally occurring during periods of reduced availability. This study aimed to discover the behaviour of a group of dependent drinkers of spirits during a 33‐day period of complete closure of physical stores selling spirits during COVID‐19 lockdown in Auckland, New Zealand, March 2020. Methods Electronic clinical records of drinkers waitlisted to complete an alcohol detox at the in‐patient service were followed from day 1 of lockdown and outcomes at the end of the period analysed. Results Drinkers of spirits were statistically more successful in stopping drinking ( P = 0.002) than those of wine or beer. Only 26% chose to switch to an alternate alcohol type initially. Discussion and Conclusion A sudden reduction in availability of spirits resulted in positive behaviour change in spirits drinkers compared to those of other alcohol types, aided by the support of detox services. Internet alcohol purchasing, while not used by this group, deserves close future scrutiny due to its potential to increase alcohol availability in dependent drinkers.